CHAPTER IX.

103. Lateral Wind Pressure on Trusses 122 104. Upper and Lower Lateral Bracing 124 105. Bridge Plans and Shopwork 125 106. Erection of Bridges 126 107. Statically Determinate Trusses 126 108. Continuous Beams and Trusses—Theorem of Three Moments 128 109. Application to Draw- or Swing-bridges 130 110. Special Method for Deflection of Trusses 130 111. Application of Method for Deflection of Triangular Frame 133 112. Application of Method for Deflection to Truss 134 113. Method of Least Work 137 114. Application of Method of Least Work to General Problem 138 115. Application of Method of Least Work to Trussed Beam 139 116. Removal of Indetermination by Methods of Least Work and Deflection 141